turn,grow,become‘表示长到18岁’‘成为一名老师’分别怎么用

一般你要说到年龄的话，口语中用turn比较好，eg- Are you turning to 18 this year? ；"Become " do not usually use to describe age.

For 'become' , you can say like" as soon as he came back, he becomes to a freak." Here, u can say become to a good teacher, but ushould betta say "be a good teacher". Coz that sounds mo comprehensive than become.

Grow is usually used like: "She is growing into a beautiful young woman" and it also depands on different situation.

明白了吧

1. turn应该是表示植物类的生长（leaves turn green 树叶变绿）
   

2. grow表示人的成长 grow to 18 years old

3. become 变得主要是变得，变成（强调结果）
   

grow up to 18 长到十八岁
become a teacher

举个例：
I'm turning into 18 this year.
I just turned 18.

I grow up to become a teacher．
I grew up and became a teacher．

turn into to a teacher
grow as a teacher
become a teacher